PATIENT CHARACTERISTICS: Age: Over 18 Performance status: Karnofsky 60-100% ECOG 0-2 Life expectancy: Greater than 6 months Hematopoietic: WBC at least 3,500/mm3 Absolute granulocyte count at least 900/mm3 Absolute leukocyte count at least 900/mm3 Platelet count at least 100,000/mm3 Hemoglobin at least 10 g/dL Hepatic: Liver function tests no greater than 2.5 times upper limit of normal Renal: Creatinine clearance at least 95 mL/min Creatinine no greater than 1.3 mg/dL Other: No history of psychiatric disease that would prevent compliance No other malignancy within the past 5 years except: Basal cell carcinoma of the skin Carcinoma in situ of the cervix Not pregnant